Twin bell alarm clock



FIG. 1 is a perspective view of a twin bell alarm clock showing my new design;

FIG. 2 is a top plan view of the twin bell alarm clock illustrated in FIG. 1;

FIG. 3 is a front elevational view of the twin bell alarm clock illustrated in FIG. 1;

FIG. 4 is a side elevational view of the twin bell alarm clock illustrated in FIG. 1, the side not shown being a mirror image of the side shown; and,

FIG. 5 is a rear elevational view of the twin bell alarm clock illustrated in FIG. 1.

The broken-line showings of FIGS. 1 and 3 are environmental only, and form no part of the claimed design. 

The ornamental design for a twin bell alarm clock, as shown and described. 